Stair.



No. 888,882. PATENTED MAY 26, 1908.

S. GROSSMAN.

STAIR.

- APPLICATION FILED JUNE 6. 1901.

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No. 888,882. PATENTED MAY 26, 1908. S. GROSSMAN.

STAIR.

APPLICATION TILED JUNE 6. 1907.

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UNITED STATES PATENT OFFICE.

SAMUEL GROSSMAN, OF NEW YORK, N. Y.

STAIR.

To all whom it may concern:

Be it known that I, SAMUEL GROSSMAN, a citizen of the United States, residing in the borough of Manhattan, New York city, county and State of New York, have invented certain new and useful Improvements in Stairs, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accom anying drawings, forming part of this specification.

My invention relates to improvements in metal stairs in which the upper surface of the tread is provided with a layer or slab of composition material such, for instance, as con crete, asphalt or cement, and the principal objects of the invention are to provi e a neat composite structure of this kind which while substantially made and possessing great strength is of a light weight, and also in which the composition material of the tread is completely protected at its forward edge by a substantial portion. of the metal struc ture itself.

With these and other objects in view, my invention consists in the various novel and peculiar arrangements and combinations of the several different parts of the device, all as hereinafter fully described and then pointed out in the claims.

I have illustrated types of my invention in the accompanying drawings, wherein:Figure 1 is a vertical longitudinal sectional view of stairs made in accordance with my invention. Fig. 2 is a similar view of stairs showin a modification of the invention.

Tn the accompanying drawings, wherein like numbers of reference designate like parts throughout, 1 indicates an ordinary stair stringer made preferably of metal and to the inner side of which are secured a series of separate angle-iron brackets 2 which are secured to the stringer by means of rivets 3. These brackets 2 are right angle shaped pieces with the vertical part thereof ada ted to receive the riser and the horizonta part thereof adapted to receive the next adjacent tread above such riser, so that each of the separate angle-iron brackets serves as a support for the riser and the next adjacent tread above the same.

Specification of Letters Patent.

Application filed June 6, 1907.

Patented May 26, 1908.

Serial No. 377,512.

Each riser 4 com rises a piece of sheet metal, preferably ro led sheet steel, cut to size and formedv at its lower end with a rearwardly extending bend 5 which forms a sufficiently deep and wide groove or channel 6 for receiving therein the rear end of the tread, below the riser, as well as a substantial quantity of the composition material 8. The lower and bent end 9 of each riser, is carried well forward and somewhat forward of the plane of the front face of the riser itself, so as to provide a substantial flange at such point, and the rear end of the tread 7, is secured to such flange by means of a bolt and nut 10, as shown in the drawings, the. nut lying upon the upper face of the tread 7, and within. the groove or channel 6. The upper end of each riser 4 is provided with a rearwardly extending flange 11, which is bolted by means of a nut and bolt 12, to the underside of the tread 7 next above the riser, and which tread. rests throu hout its width upon the upper flange of suc riser. The nut of the bolt 12 lies upon the upper surface of the tread 7, and is, like the nut of the other bolt, at the rear, embedded in the mass of composition material, 8. The upper flange 11 of the riser is in the same plane with the horizontal flange of the angle-iron 2, so that the tread 7 rests flatly upon the respective flanges of these two parts.

In Fig. 1, the tread 7 is carried forwardly of the riser 4, next below it, and is provided with a downward bend 13 and is thence carried upwardly and backwardly in a horizontal direction where it terminates in a flange 14. This bend provides, on its exterior, a shoulder 15, into which the corner or angle at the upper end of the tread fits, as shown in the drawing. Upon the interior, this bend provides a comparatively dee groove or channel 16 into which the plastic material 8 extends, while the flange 14 thereof provides practically a countersunk place 17 for the plastic material, which being likewise held at the rear end in the groove 6 of the riser 4, is thus securely retained in its position after it is once placed therein and becomes hardened or set. In inserting the composition 8,

which is done when it is in plastic condition, the same is filled into the recess, which is provided upon the upper surface of the tread by means of the bent up part 13 and 14 at the forward end, and this material is filled in such manner that its upper surface is ilush with the metallic flange 14, at the forward end of the tread. In this way the sheet metal of the riser 7 being thus carried forwardly and upwardly constitutes the forward edge or nose of the composite edge and, of course, protects the less durable composition 8, at a oint where it would necessarily be subjecte 'to hard usage. When once the composition 8, which may be of any suitable well-known material, such as cement, asphalt or concrete or the like, and is inserted in plastic condition, becomes hard, it forms a ermanent part of the stair structure and it is so securely retained in place at its front and rear edge that it is impossible for it to Work loose or become dislodged. Furthermore, the joint made at the rear of the composition material 8 and the riser 4 is a very close one which practically seals the structure at that point and prevents the working in of any foreign material.

In Fi 2, the forward end of the tread 18 is mod' ed by being unbent and flat, while the upper end of the riser 19 is modified by bein ent forwardly, upwardly and rear wariIly at 20, 21, and 22 to provide the same sort of metallic edge or nose, as shown in Fig. 1, both for the urpose of protecting the for- Ward edge of tie composition 8, as well as providing a deep recess in the upper surface of the tread for receiving such composition. In this structure, the forward end of the tread 18 is bolted, by means of a nut and bolt 23, to the forward bend 20 of the riser 19, Which bend 20 is flush with the horizontal flange of the angle-iron bracket 2, and the bolt of the nut 23 lies within the recess in which the plastic material is filled. In other respects the structure is similar to that descr1bed in reference to Fig. 1.

An important advantage in the manner of constructing the recessed tread and of insertin or placing therein the composition material forming the upper surface thereof is that such composition is easily filled in and may be made in a very thick body which will last a very long time, and the manner of retaining the composition in place holds it securely by both lts front and rear edge, so as to prevent any liability of working loose, it being undercut at both of such edges. In the construction shown in Fig. 1, the metallic tread 7 has the forward extension 13, 14, which is bent upwardly and thence back upon itself, formed integral with the tread and this has certain advantages in regard to strength. In this construction there IS an absence of any rivet heads upon the underside of the tread, thereby presenting a smoother and neater appearance.

Having thus described my invention what ll. claim and desire to secure by Letters Patcnt is:

1. Stairs having suitably supported sepa rate metal risers and treads, the riser having .its upper end flanged and fastened to the adjacent tread above, and having its lower end provided with a groove or recess for receiving the rear end. of the next adjacent tread and also the body of material on said tread, and a body of material placed upon. said tread.

2. Stairs having suitably supported separate metal risers and treads, the riser having its upper end flanged and fastened to the adjacent tread above, and having its lower end provided with a groove or recess for receiving the rear end ofthe next adjacent tread and also the body of material on said tread, a rearwardly opening recess or groove at the forward end of said tread also adapted to receive the body of material, and a body of material placed upon said tread.

3. Stairs having suitably supported separate metal risers and treads, the tread having its forward end provided with a recess for receiving and holding a body of material, the adjacent riser being provided at its lower edge with a recess for the body of material, and a body of material on said tread.

4. Stairs having suitably supported separate metal risers and treads, the tread having its forward end provided with a recess for receiving and holding a body of material, the adjacent riser being provided at its lower edge with a recess or groove extending backwardly beyond the plane of the body of the riser for receiving the rear end of the adjacent tread and the body of material, and a body of material on said tread.

5. Stairs having suitably supported separate metal risers and treads, the tread having its forward end provided with a recess for receiving and holding a body of material, the adjacent riser being provided at its lower edge with a rearwardly extending recess or groove, the rear end of the adjacent tread lying within said recess or groove 011 the riser and being fastened thereto, and the upper end of the riser being fastened to the adjacent tread, and a body of material on said tread.

6. Stairs having suitably supported separate metal risers and treads, the tread having its forward end provided with a recess for receiving and holding a body of material, the adjacent riser being provided at its lower edge with a rearwardly extending recess or groove, the rear end of the adjacent tread lying within said recess or groove on the riser and being fastened thereto, and the upper end of the riser being provided with a flange fastened to the adjacent tread, and a body of material on said tread.

In testimony whereof, I have hereunto set my hand in the presence of the two subscrib- 10 ing witnesses.

SAMUEL GR OSSMAN.

Witnesses;

BERNARD S. DEU'rsoH, SAMUEL B. PoLLoK. 

